2. Difference between Postgres Pro Standard and PostgreSQL

Postgres Pro provides the most actual PostgreSQL version with some additional patches applied and extensions added. Mostly, these are patches already accepted by the PostgreSQL community and committed into PostgreSQL. Also there some patches and extensions developed by Postgres Professional. Users of Postgres Pro thus have early access to some important features and fixes.

Currently the difference between Postgres Pro Standard and PostgreSQL is the following:

Full text search improvements: phrase search, hunspell morphology, some dictionaries are bundled with distribution and can be enabled by a single SQL statement, shared_ispell allowing to store dictionaries in shared memory

libicu support on all platforms, providing platform-independent sort for various locales

Postgres Pro Standard releases are following the PostgreSQL releases, though sometimes occur more frequently. The Postgres Pro Standard versioning scheme is based on the PostgreSQL one and has an additional decimal place.